Issues

• Generating and interpreting tags for union types

  rnag/dataclass-wizard#255 · Filter by author dozed opened on Aug 15, 2026

• CatchAll fields break on reuse across structural contexts (self-referential dataclasses are a special case) — TypeError: issubclass() arg 1 must be a class

  rnag/dataclass-wizard#252 · Filter by author sammck opened on Jul 26, 2026

• CatchAll + earlier field with a default: TypeError 'got multiple values for argument'

  rnag/dataclass-wizard#251 · Filter by author sammck opened on Jul 17, 2026

• EnvWizard does not work correctly when the environment variable name contains numbers.

  rnag/dataclass-wizard#250 · Filter by author rexzhang opened on Jul 13, 2026

• Type hint Dict[int | Literal["123"], str] incorectly processed

  rnag/dataclass-wizard#245 · Filter by author ctisserand opened on Apr 28, 2026

• EnvWizard: clarify precedence rules + add from_env / to_env helpers

  documentationenhancement
  rnag/dataclass-wizard#233 · Filter by author rnag opened on Dec 21, 2025

• Add optional pandas helpers: to_dataframe / from_dataframe for flat dataclasses

  data-scienceenhancement
  rnag/dataclass-wizard#232 · Filter by author rnag opened on Dec 21, 2025

• Add optional orjson backend and to_json_bytes / from_json_bytes helpers

  enhancementperformance
  rnag/dataclass-wizard#231 · Filter by author rnag opened on Dec 21, 2025

• Add dataclass_wizard.formats.* functional API (loads/dumps/load/dump) for JSON/YAML/TOML/ENV

  APIdocumentationenhancement
  rnag/dataclass-wizard#230 · Filter by author rnag opened on Dec 21, 2025

• Support loading from attribute-based objects (from_attributes)

  enhancement
  rnag/dataclass-wizard#228 · Filter by author rnag opened on Dec 21, 2025

• breaking change with 3.14: local method list() interferes with typing

  acknowledgedbughelp wantedtyping
  rnag/dataclass-wizard#219 · Filter by author parmentelat opened on Dec 18, 2025
  5

• Alias Path: Minor optimization

  good first issuelow-priority
  rnag/dataclass-wizard#215 · Filter by author rnag opened on Dec 14, 2025

• mypy invalid syntax in python version 3.11 and earlier

  acknowledgedawaiting-user-input
  rnag/dataclass-wizard#199 · Filter by author bpstark opened on Aug 22, 2025
  1

• Argument type is partially unknown for a union of date/time patterns

  rnag/dataclass-wizard#193 · Filter by author goncalossilva opened on Apr 18, 2025

• TypeError: unsupported operand type(s) for |: 'PatternBase' and 'PatternBase'

  rnag/dataclass-wizard#189 · Filter by author goncalossilva opened on Apr 7, 2025
  1

• Fail to parse a field that could a string or an object

  acknowledgedawaiting-user-input
  rnag/dataclass-wizard#187 · Filter by author anobli opened on Mar 9, 2025
  1

• Use AliasPath with Meta

  acknowledgedawaiting-user-inputenhancement
  rnag/dataclass-wizard#184 · Filter by author fabianoengler opened on Feb 14, 2025
  1

• Filter field(init=False) from json and dict

  acknowledgedenhancement
  rnag/dataclass-wizard#178 · Filter by author tfmoraes opened on Jan 28, 2025
  1

• Ensure Uniqueness for Recursive Generic types

  buglow-priorityself-created
  rnag/dataclass-wizard#172 · Filter by author rnag opened on Dec 30, 2024

• Strict Mode for "Strict" Equivalence of Literals (type)

  enhancementlow-priorityself-created
  rnag/dataclass-wizard#170 · Filter by author rnag opened on Dec 29, 2024

• E3701: Invalid usage of field(), it should be the value of an assignment within a dataclass. (invalid-field-call)

  acknowledged
  rnag/dataclass-wizard#168 · Filter by author stdedos opened on Dec 13, 2024
  1

• Add UnionChecker to Optimize Union or | Type Deserialization for Common Python Types (e.g., int, Enum, Literal)

  Great To Have!help wantedperformanceself-created
  rnag/dataclass-wizard#166 · Filter by author rnag opened on Dec 8, 2024

• Upcoming Changes in V1

  enhancementperformance
  rnag/dataclass-wizard#155 · Filter by author rnag opened on Nov 27, 2024

• Optimize Dump/Serialize Process

  Great To Have!performanceself-created
  rnag/dataclass-wizard#154 · Filter by author rnag opened on Nov 27, 2024

• [performance] Optimize load/dump function to remove for loop

  low-priorityperformanceself-created
  rnag/dataclass-wizard#131 · Filter by author rnag opened on Nov 3, 2024